0. Campa, spoken in eastern central Peru, has been classified with the large and widely scattered Arawak linguistic stock. That it is closely related to Machiguenga is well known and generally accepted among Peruvians. Its relationship to Amuesha, a neighboring tribe, is not apparent although the latter too is considered by some as belonging to the same family of Indian languages. The family includes also certain tribes of Bolivia and Paraguay.' According to the latest Peruvian census (1940) the Campa language is spoken by 33,000 Indians who are sparsely scattered over the Upper Ucayali region of the Amazon Basin. This description is based on material gathered from one informant, Alfonso, who lives at Shirintiari, a plantation on the Tambo River of eastern Peru. Some of the material has been checked with speakers of other dialects of the language; numerous dialects have been observed but are beyond the scope of this paper.2